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  4. Which of the following atoms has no neutron in its nucleus?

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Q. Which of the following atoms has no neutron in its nucleus?

Uttarkhand PMTUttarkhand PMT 2010

Solution:

Protium is the most abundant isotope of hydrogen with an abundance of almost $99 \%$.
It's symbol is $H_{1}^{1}$. Its atomic number is $1$ and its mass number is also $1$.
So it does not possess any neutron.
Whereas,
Helium, $H e_{2}^{4}$, has $2$ neutrons
Lithium, $L i_{3}^{7}$, has $4$ neutrons
Tritium, $H_{1}^{3}$, has $2$ neutrons